On Feb 16, 2006, at 2:36 AM, Christian Rössel wrote:
Hello Newsgroup,
in the following code the call bind (&boost::tuple<int, double>::get<0>, _1) does not compile whereas an analogous call with a non-template parameter compiles fine. What am I doing wrong?
If I remember correctly, get has two overloads (one const, one without const). One cannot take the address of an overloaded (member) function without specifying its type. (This is without looking at the tuple code, so comes with a caveat) Best, Jaakko Järvi
I'm using boost 1.33.1 and Visual Studio 7.1
Thanks in advance, Christian
#include <vector> #include <algorithm> #include <string> #include <boost/lambda/lambda.hpp> #include <boost/lambda/bind.hpp> #include <boost/tuple/tuple.hpp>
class SearchForMe { std::string a_; public: std::string getA () {return a_;} };
int main(int argc, char* argv[]) { using namespace std; using namespace boost::lambda;
vector<SearchForMe> foo; // compiles fine find_if (foo.begin (), foo.end (), bind (&SearchForMe::getA, _1) == "apple");
vector< boost::tuple<int, double> > bar; // does not compile find_if (bar.begin (), bar.end (), bind (&boost::tuple<int, double>::get<0>, _1) == 15);
return 0; }
The error messages are:
Compiling... boost_lambda.cpp d:\home\roe\c++_tests\boost_lambda\boost_lambda\boost_lambda \boost_lambda.cpp(31) : error C2784: 'const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost ::lambda::action<2,boost::lambda::function_action<2,Result>>,detail::b ind_tuple_mapper<const Arg1,const Arg2>::type>> boost::lambda::bind(const Arg1 &,const Arg2 &)' : could not deduce template argument for 'overloaded function type' from 'overloaded function type'
d:\home\roe\boost_1_33_1\boost\lambda\detail\bind_functions.hpp(232) : see declaration of 'boost::lambda::bind' d:\home\roe\c++_tests\boost_lambda\boost_lambda\boost_lambda \boost_lambda.cpp(31) : error C2784: 'const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost ::lambda::action<2,boost::lambda::function_action<2,Result>>,detail::b ind_tuple_mapper<const Arg1,const Arg2>::type>> boost::lambda::bind(const Arg1 &,const Arg2 &)' : could not deduce template argument for 'overloaded function type' from 'overloaded function type'
d:\home\roe\boost_1_33_1\boost\lambda\detail\bind_functions.hpp(232) : see declaration of 'boost::lambda::bind' d:\home\roe\c++_tests\boost_lambda\boost_lambda\boost_lambda \boost_lambda.cpp(31) : error C2784: 'const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost ::lambda::action<Arity,Act>,detail::bind_tuple_mapper<const Arg1,const Arg2>::type>> boost::lambda::bind(const Arg1 &,const Arg2 &)' : could not deduce template argument for 'overloaded function type' from 'overloaded function type' with [ Arity=2, Act=boost::lambda::function_action<2> ]
d:\home\roe\boost_1_33_1\boost\lambda\detail\bind_functions.hpp(212) : see declaration of 'boost::lambda::bind' d:\home\roe\c++_tests\boost_lambda\boost_lambda\boost_lambda \boost_lambda.cpp(31) : error C2784: 'const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost ::lambda::action<Arity,Act>,detail::bind_tuple_mapper<const Arg1,const Arg2>::type>> boost::lambda::bind(const Arg1 &,const Arg2 &)' : could not deduce template argument for 'overloaded function type' from 'overloaded function type' with [ Arity=2, Act=boost::lambda::function_action<2> ]
d:\home\roe\boost_1_33_1\boost\lambda\detail\bind_functions.hpp(212) : see declaration of 'boost::lambda::bind' d:\home\roe\c++_tests\boost_lambda\boost_lambda\boost_lambda \boost_lambda.cpp(31) : error C2784: 'const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost ::lambda::action<Arity,Act>,detail::bind_tuple_mapper<const Arg1,const Arg2>::type>> boost::lambda::bind(const Arg1 &,const Arg2 &)' : could not deduce template argument for 'overloaded function type' from 'overloaded function type' with [ Arity=2, Act=boost::lambda::function_action<2> ]
d:\home\roe\boost_1_33_1\boost\lambda\detail\bind_functions.hpp(212) : see declaration of 'boost::lambda::bind' d:\home\roe\c++_tests\boost_lambda\boost_lambda\boost_lambda \boost_lambda.cpp(31) : error C2784: 'const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost ::lambda::action<2,boost::lambda::function_action<2,Result>>,detail::b ind_tuple_mapper<Result(__cdecl &)(Par1),const Arg2>::type>> boost::lambda::bind(Result (__cdecl &)(Par1),const Arg2 &)' : could not deduce template argument for 'overloaded function type' from 'overloaded function type'
d:\home\roe\boost_1_33_1\boost\lambda\detail\bind_functions.hpp(190) : see declaration of 'boost::lambda::bind' d:\home\roe\c++_tests\boost_lambda\boost_lambda\boost_lambda \boost_lambda.cpp(31) : error C2784: 'const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost ::lambda::action<2,boost::lambda::function_action<2,Result>>,detail::b ind_tuple_mapper<Result(__cdecl &)(Par1),const Arg2>::type>> boost::lambda::bind(Result (__cdecl &)(Par1),const Arg2 &)' : could not deduce template argument for 'overloaded function type' from 'overloaded function type'
d:\home\roe\boost_1_33_1\boost\lambda\detail\bind_functions.hpp(190) : see declaration of 'boost::lambda::bind' d:\home\roe\c++_tests\boost_lambda\boost_lambda\boost_lambda \boost_lambda.cpp(31) : error C2784: 'const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost ::lambda::action<2,boost::lambda::function_action<2,Result>>,detail::b ind_tuple_mapper<Result(__cdecl &)(Par1),const Arg2>::type>> boost::lambda::bind(Result (__cdecl &)(Par1),const Arg2 &)' : could not deduce template argument for 'overloaded function type' from 'overloaded function type'
d:\home\roe\boost_1_33_1\boost\lambda\detail\bind_functions.hpp(190) : see declaration of 'boost::lambda::bind' d:\home\roe\c++_tests\boost_lambda\boost_lambda\boost_lambda \boost_lambda.cpp(31) : error C2780: 'const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost ::lambda::action<1,boost::lambda::function_action<1,Result>>,detail::b ind_tuple_mapper<const Arg1>::type>> boost::lambda::bind(const Arg1 &)' : expects 1 arguments - 2 provided
d:\home\roe\boost_1_33_1\boost\lambda\detail\bind_functions.hpp(91) : see declaration of 'boost::lambda::bind' d:\home\roe\c++_tests\boost_lambda\boost_lambda\boost_lambda \boost_lambda.cpp(31) : error C2780: 'const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost ::lambda::action<Arity,Act>,detail::bind_tuple_mapper<const Arg1>::type>> boost::lambda::bind(const Arg1 &)' : expects 1 arguments - 2 provided with [ Arity=1, Act=boost::lambda::function_action<1> ]
d:\home\roe\boost_1_33_1\boost\lambda\detail\bind_functions.hpp(71) : see declaration of 'boost::lambda::bind' d:\home\roe\c++_tests\boost_lambda\boost_lambda\boost_lambda \boost_lambda.cpp(31) : error C2780: 'const boost::lambda::lambda_functor<boost::lambda::lambda_functor_base<boost ::lambda::action<1,boost::lambda::function_action<1,Result>>,detail::b ind_tuple_mapper<Result(__cdecl &)(void)>::type>> boost::lambda::bind(Result (__cdecl &)(void))' : expects 1 arguments - 2 provided
d:\home\roe\boost_1_33_1\boost\lambda\detail\bind_functions.hpp(49) : see declaration of 'boost::lambda::bind'
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